Variable Interest Entities - Additional Information (Details) - Clean Energy Businesses - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Variable Interest Entity [Line Items]
Equity method investments		$ 11		$ 11
Variable Interest Entity, Primary Beneficiary | CED Nevada Virginia
Variable Interest Entity [Line Items]
Income (loss) before tax			$ 39
Net income (loss)			29
Variable Interest Entity, Primary Beneficiary | Tax Equity Projects
Variable Interest Entity [Line Items]
Income (loss) before tax	$ 18		28	13
Net income (loss)	13		21	10
Variable Interest Entity, Primary Beneficiary | Tax Equity Investors | CED Nevada Virginia
Variable Interest Entity [Line Items]
Income (loss) before tax		53	(42)	53
Net income (loss)		(40)	(32)	40
Variable Interest Entity, Primary Beneficiary | Tax Equity Investors | Tax Equity Projects
Variable Interest Entity [Line Items]
Income (loss) before tax	(1)	6	(7)	8
Net income (loss)	$ (1)	5	$ (5)	$ 6
Variable Interest Entity, Primary Beneficiary | Con Edison Development | Tax Equity Projects
Variable Interest Entity [Line Items]
Income (loss) before tax		10
Net income (loss)		$ 7
Percentage of variable interests (less than)			100.00%